T1 CSU/DSU Card - Description

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018Web site: www.blackbox.com • E-mail: [email protected]

CUSTOMER SUPPORT

INFORMATION

JANUARY 1997MT510A-R2

T1 CSU/DSU Card

TX

BPV

REMOTE

OUT

OUT

MON

RX I

N

IN

MON

LOCAL

AGGREGATE

LOOPBACK

REMOTE

LOCAL

CHANNEL

NETWORK

LOS

YEL RED

TEST SYNC

RTS

CHNL

TD

RDRLSD

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FEDERAL COMMUNICATIONS COMMISSIONAND

INDUSTRY CANADARADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and usedproperly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radiocommunication. It has been tested and found to comply with the limits for a Class A computing device inaccordance with the specifications in Subpart B of Part 15 of FCC rules, which are designed to providereasonable protection against such interference when the equipment is operated in a commercialenvironment. Operation of this equipment in a residential area is likely to cause interference, in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’sauthority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the RadioInterference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériquesde la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.

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INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótanomojado o cerca de una alberca, etc..

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones deoperación. Todo otro servicio deberá ser referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparatoeléctrico sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar enlibreros o gabinetes que impidan el flujo de aire por los orificios de ventilación.

10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufasu otros aparatos (incluyendo amplificadores) que producen calor.

11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo deoperación, o como se indique en el aparato.

12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetoscolocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios deventilación.

18. Servicio por personal calificado deberá ser provisto cuando:

A: El cable de poder o el contacto ha sido dañado; u

B: Objectos han caído o líquido ha sido derramado dentro del aparato; o

C: El aparato ha sido expuesto a la lluvia; o

D: El aparato parece no operar normalmente o muestra un cambio en su desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

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TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

AT&T is a registered trademark of American Telephone and Telegraph Company.

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ContentsChapter Page

1. Specifications................................................................................................................................................6

2. Introduction .................................................................................................................................................8

2.1 Overview ..............................................................................................................................................8

2.2 Controls and Indicators....................................................................................................................11

2.2.1 Network Bantam Jacks .......................................................................................................11

2.2.2 Diagnostic Loopback Switches ..........................................................................................11

2.2.3 Network LEDs ....................................................................................................................11

2.2.4 Channel LEDs ....................................................................................................................12

2.2.5 LBO Switch.........................................................................................................................13

2.2.6 Configuration DIP Switches ..............................................................................................13

2.2.7 NET Interface.....................................................................................................................13

2.2.8 COM A Interface................................................................................................................16

2.2.9 Port A Interface..................................................................................................................16

2.2.10 Port B Interface................................................................................................................17

3. Installation ..................................................................................................................................................18

3.1 Unpacking the Card .........................................................................................................................18

3.2 Site Preparation ................................................................................................................................18

3.3 T-1 Network .......................................................................................................................................19

3.4 Installing the T1 CSU/DSU Card Module......................................................................................19

4. Configuration .............................................................................................................................................23

4.1 Configuration DIP Switches .............................................................................................................23

4.2 Network Timing ................................................................................................................................26

4.3 DTE Channel Timing .......................................................................................................................28

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Chapter Page

5. Troubleshooting .........................................................................................................................................30

5.1 Power Problems ................................................................................................................................30

5.2 Network or Port Problems................................................................................................................30

5.3 Diagnostic Loopbacks.......................................................................................................................31

5.4 Calling Your Supplier .......................................................................................................................33

5.5 Shipping and Packaging...................................................................................................................33

Appendix A. FCC Document Requirements ................................................................................................34

Appendix B. CPE Affidavit.............................................................................................................................35

Appendix C. Cabling......................................................................................................................................38

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1. SpecificationsConfiguration and Control (2) 12-switch DIPs

Internal CSU Local and remote loopback diagnostics; Type I Keep-Alive signal

Clocking Modes Internally provided; External from the network (loop); External from the DTE (channel)

DTE Channel Port A (RS-530 physical) selectable for V.35 or RS-449 operations; Density: Alternate DS0 (Fractional T-1), contiguous; Selectable DTE channelrates n x 56 Kbps (56, 112, 168, 224, 336, 448, 672, 1344); Selectable DTE channel rates n x 64 Kbps (64, 128, 192, 256, 384, 512, 768, 1536)

Compatibility AT&T® Pub 62411; AT&T Pub 54019A; Carrier T-1 Service Offerings; Carrier Fractional T-1 Service Offerings

Diagnostics Local Aggregate Loopback, Remote Aggregate Loopback, Local and Remote Channel Loopbacks, Tx Out/Rx In and Mon Out/In Bantam Jacks

Network Indicators (6) LEDs: Loss Of Signal (LOS), Bipolar Violations (BPV), Synchronization, Red Alarm, Yellow Alarm, Test

DTE Channel Indicators (4) LEDs: Transmit Data (TD), Receive Data (RD), Request To Send (RTS), Received Line Signal Detector (RLSD)

Operating Temperature 32 to 122°F (0 to 50°C)

Relative Humidity Tolerance 10 to 95%, noncondensing

Maximum Altitude Tolerance 10,000 feet (3048 m)

Voltages (From mid-plane of the WAN Rack 16) +5 VDC, -5 VDC, +12 VDC, -12 VDC

Size 8.25" x 9" (21 x 22.8 cm)

Weight 1 lb., 5 oz. (595.3 grams)

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Network InterfaceRecommended Cable Twisted Shielded Pair (TSP)

Line Rate 1.544 Mbps ±50 bps

Line Encoding Format AMI or B8ZS

Framing Format D4 or ESF

Pulse Characteristics AT&T 62411 compliant

Output Amplitude 2.4 to 3.3 V peak-to-peak

Receiver Sensitivity 0 to -26 dB

Line Build-Out (CSU) 0 dB, -7.5 dB, -15 dB

Line Distance (DSX-1 Mode) 0 to 655 ft. (0 to 200 m)

Line Distance (CSU Mode) 0 to 6000 ft. (0 to 1,829 m) with 22 AWG

Physical Interface RJ-48C

Density Monitoring 1 of 8, 1 of 16, 1 of 32, 1 of 48, 1 of 64, or None

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2. Introduction

2.1 OverviewThe T1 CSU/DSU Card is a high speed T-1 and Fractional T-1 CSU/DSU-format processor in modularcircuit-board form. See Figure 2-1. The T1 CSU/DSU Card is installed vertically into the front of theWAN Rack 16. For additional WAN Rack 16 information, refer to the WAN Rack 16 manual.

Figure 2-1. T1 CSU/DSU Card.

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Functional features of the T1 CSU/DSU Card are:

• Single port CSU/DSU for T-1 and Fractional T-1 applications.

• Provides WAN (Wide Area Network) access to LAN internetworking, CAD/CAM, video conferencing,computer and PBX equipment.

• DIP-switch configuration and control.

• RS-530 physical interface applications port. Configured to support V.35 or RS-449.

• Compatible with carrier service offerings and standards-based T-1 equipment.

• On-board switch-selected diagnostics.

• Ability to drive T-1 signals (using shielded twisted-pair cabling) up to 6000 feet (1,829 m).

The T1 CSU/DSU Card can process digital information from a single high-density DB26, software-selectable DCE port supporting V.35 or RS-449 applications at speeds of either n x 56 Kbps (56, 112, 168,224, 336, 448, 672, 1344) or n x 64 Kbps (64, 128, 192, 256, 384, 512, 768, 1536), depending on theformat and density requirements of the application.

The DTE port (Port A) is on a separate I/O interface module, which installs vertically in the rear of theWAN Rack 16 chassis. The I/O interface module is illustrated in Figure 2-2.

NOTEThe second DTE Port (Port B) on the I/O interface module is not supported by the T1CSU/DSU Card and should not be cabled.

The T1 CSU/DSU Card provides framing and density requirements for transmission across predefinednetwork facilities. Timing (clock) may be derived from either the T-1 line (loop-slave), an internalStratum Level IV crystal oscillator (internal-master), or externally from the DTE (external channel).

All application configurations are switch-selected through two 12-switch DIPs (S1 and S3) mounted onthe T1 CSU/DSU Card. See Figure 2-1.

The T1 CSU/DSU Card also provides continuous network and channel (DTE) signal monitoring. Whenthe LED display shows network degradation, you can use a series of loopback tests to troubleshoot theunit and its network quickly and accurately.

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Figure 2-2. I/O Interface Module.

NET

COM

A

PORT

A

PORT

B

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2.2 Controls and Indicators2.2.1 NETWORK BANTAM JACKS

The four network Bantam jacks, located on the front of the T1 CSU/DSU Card, provide access to thenetwork aggregate for either monitoring or testing (signal injection) purposes. See Figure 2-1.

• The MON OUT jack passively monitors the aggregate signal, on the T-1 network side, generated byyour unit.

• The TX OUT jack allows you to inject a DS-1 test signal toward the T-1 line.

• The MON IN jack passively monitors the aggregate signal, on the T-1 network side, received from thecarrier.

• The RX IN jack allows you to interrupt the aggregate signal, on the T-1 network side, and replaceyour unit’s network receiver with the test set’s receiver.

To monitor (without interrupting aggregate application data) the T-1 carrier service, connect a T-1 testset between the MON OUT jack and the MON IN jack.

To inject and receive a test signal (application data will be interrupted) across the T-1 network, firstconnect a T-1 test set between the TX OUT jack and the RX IN jack. Then put the T1 CSU/DSU Carddiagnostic CHNL loopback switch in the REMOTE position.

NOTEUsing the TX OUT and RX IN Bantam jacks will disrupt your application data.

2.2.2 DIAGNOSTIC LOOPBACK SWITCHES

The two diagnostic loopback switches, located on the front of the T1 CSU/DSU Card, provide manualcontrol over the execution of four diagnostic loopbacks: Local Aggregate, Remote Aggregate, LocalChannel, and Remote Channel. See Figure 2-1.

Refer to Chapter 5 for additional information on the diagnostic loopbacks.

2.2.3 NETWORK LEDS

The six network LEDs, located on the front of the T1 CSU/DSU Card, provide a visual status of networkconditions. See Figure 2-1. The information conveyed by each network LED is described in Table 2-1.

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Table 2-1. Network LED Information

LED Name LED Color Description

Bipolar Violation (BPV) Red When lit, indicates that a pulse was received that is of the same polarity as the preceding pulse(excluding B8ZS codewords). This is in violation of the Alternative Mark Inversion (AMI) rule.

Loss of Sync (LOS) Red When lit, indicates a lack of sufficient signal pulses(marks) at the network receiver to maintainsynchronization.

Yellow Alarm (YEL) Yellow When lit, indicates that the remote transmitter is in a Red-Alarm condition and is transmitting the Yellow-Alarm signal.

Red Alarm (RED) Red When lit, indicates that the local T1 CSU/DSU Cardhas lost frame synchronization for 2 to 2.5 seconds.The LED will go out after frame synchronization is acquired and maintained for at least 8 consecutiveseconds.

Test (TEST) Red When lit, indicates that the local T1 CSU/DSU Cardis either conducting a diagnostic loopback operation,or the network is experiencing diagnostic testing.

Synchronization (SYNC) Red When lit, indicates that the local T1 CSU/DSU Card is synchronized with the remote unit.Synchronization is achieved following the receipt of 10 consecutive framing bits. Synchronization is lost if 2 out of 4 consecutive frame words are in error.

2.2.4 CHANNEL LEDS

The four channel LEDs, located on the front of the T1 CSU/DSU Card, provide a visual status ofchannel (DTE) conditions. See Figure 2-1. The information conveyed by each channel LED is describedin Table 2-2.

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Table 2-2. Channel LED Information

LED Name LED Color Description

Ready to Send (RTS) Green When lit, indicates that the DTEchannel port’s RTS function has been activated.

Transmit Data (TD) Green When lit, indicates that the DTEchannel port is transmitting data across the T-1 network.

Received Line Signal Detector (RLSD) Green When lit, indicates that the DTEchannel port’s RLSD function has been activated.

Receive Data (RD) Green When lit, indicates that the DTEchannel port is receiving data from the T-1 network.

2.2.5 LBO SWITCH

The Line Build-Out (LBO) switch, located on the T1 CSU/DSU Card behind the top ejector tab,regulates the transmitted dB line level strength. This 3-position switch (0 dB, -7.5 dB, and -15 dB) slide switch is set according to the T-1 carrier requirements. See Figure 2-3.

NOTEMake sure that the LBO switch is in its proper dB position before the T1 CSU/DSU Cardis installed in the WAN Rack 16.

2.2.6 CONFIGURATION DIP SWITCHES

The T1 CSU/DSU Card is controlled by switches S1 and S3. These switches, located at the top of the T1 CSU/DSU Card, are set to match specific application requirements. See Figure 2-1.

Refer to Chapter 4 for detailed information about configuring the T1 CSU/DSU Card using these DIP switches.

NOTEMake sure that the configuration DIP switches are set before the T1 CSU/DSU Card isinstalled in the WAN Rack 16.

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Figure 2-3. LBO Switch Positions.

-15dB POSITION

LBO SWITCH

-7.5dB POSITION

LBO SWITCH

0dB POSITION

LBO SWITCH

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2.2.7 NET INTERFACE

The NET (Network) interface, located on the I/O interface module, provides for the transmission andreceipt of the T-1 aggregate. Cables attach to this interface through an 8-pin RJ-48 connector. Thepinouts for the NET interface connector are illustrated in Figure 2-4.

The NET interface may be configured to support various aggregate configurations using the DIPswitches located on the T1 CSU/DSU Card. To configure the NET interface, refer to Chapter 4.

This interface connector may be cabled to accommodate several different types of configurations. Forinformation on these configurations, refer to Appendix C.

An RJ-48 loopback plug or cable (not provided) can be plugged into the NET interface connector. Thisconnector, when plugged in during troubleshooting, is used to isolate the unit from the T-1 line. Thepin-out for this plug (cable) is illustrated in Figure 2-4.

Figure 2-4. NET Interface Pinout.

PIN DESCRIPTION

1 Rx RING

2 Rx TIP

3 NO CONNECTION

4 Tx RING

5 Tx TIP

6 NO CONNECTION

7 GROUND

8 GROUND

1 8

LOOPBACK PLUG

LOCKING CLIP

1

8

1425

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2.2.8 COM A INTERFACE

The COM A interface port, located on the I/O interface module, is not used.

2.2.9 PORT A INTERFACE

The Port A interface, located on the I/O interface module, is designed as a DCE interface and providesfor the electrical transmission/reception of serial digital information. For ease of cabling, the pinouts(signal names) associated with this port match the pinouts found on a DTE port.

This interface port, based on the EIA RS-530 specification, uses a high-density DB26 connector, and maybe configured to support either V.35 or RS-449 applications. You’ll also need to get an HD26M-to-M34adapter cable, part number EHN069. The pinouts for the HD DB26 connector are shown in Figure 2-5.

To configure the Port A interface for DTE channel operations, refer to Chapter 4.

Figure 2-5. High-Density DB26 (Port A) Pinout.

Pin Signal1 FRAME2 TD (A)3 RD (A)4 RTS (A)5 CTS (A)6 DSR (A)7 SG8 DCD (A)9 RT (B)

11 TT (B)12 ST (B)14 TD (B)15 ST (A)16 RD (B)17 RT (A)19 RTS (B)20 DTR (A)22 DSR (B)24 TT (A)

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Three cabling configurations exist for the Port A interface (refer to Appendix C). Each cablingconfiguration is based on the type of connector on the DTE:

• DTE running V.35 applications equipped with a 34-pin connector block. Attachment to the I/Ointerface module’s Port A interface is through a 34-pin-to-HD DB26 adapter cable (part numberEHN069).

• DTE running RS-530 applications equipped with a 25-pin connector. Attachment to the I/Ointerface module’s Port A interface is through an HD 26-pin-to-25-pin RS-530 cable.

• DTE running RS-449 applications equipped with a 37-pin connector. Attachment to the I/Ointerface module’s Port A interface is through a 37-pin-to-25-pin adapter cable.

2.2.10 PORT B INTERFACE

The Port B interface port, located on the I/O interface module, is not used by the T1 CSU/DSU Card.

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3. Installation

3.1 Unpacking the CardThe T1 CSU/DSU Card communication module is shipped in a carton designed to ensure that it arrivesat your location safely and undamaged.

To unpack and inspect the T1 CSU/DSU Card and its I/O interface module:

1. Carefully remove all packing material from the carton. The carton should contain:

• T1 CSU/DSU Card communication module,

• I/O interface module,

• This manual.

2. Inspect the items for damage that may have occurred during shipment. If any damage is notedor if items are missing, contact your supplier.

NOTESave the packing material and carton in case you need to store or return the unit.

3.2 Site PreparationPower—The T1 CSU/DSU Card operates in a Direct Current (DC) environment provided by the WANRack 16’s mid-plane chassis. This mid-plane supplies voltages of +5 VDC, -5 VDC, +12 VDC, and -12 VDC.

Environmental—The T1 CSU/DSU Card is designed to operate effectively under a wide range ofenvironmental conditions, as listed in Chapter 1.

CAUTIONTo make sure that environmental factors do not hinder the T1 CSU/DSU Card’sperformance, do not exceed the recommended ranges.

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3.3 T-1 NetworkBefore you install the T1 CSU/DSU Card, here are a few things to consider:

• Consult your network designer to determine specifications for your T-1 line. Your local carrierwill have configured the T-1 line based on your requirements.

• T-1 network specifications include such parameters as encoding methods (AMI or B8ZS) andframing (D4 or ESF). This information will be used when configuring your T1 CSU/DSU Card.

• The T-1 line should be Local (non-powered) or “DRY.”

• The T-1 line should be thoroughly tested end-to-end before your T1 CSU/DSU Card isconnected.

• We recommend installing lightning-protection equipment on the T-1 line. It dischargeselectrical surges, so that your equipment (including the T1 CSU/DSU Card) won’t bedamaged.

• Make sure that the wiring and installation of network-support equipment, such as the SmartJack, is complete.

3.4 Installing the T1 CSU/DSU Card ModuleTo install the T1 CSU/DSU Card module, complete the steps listed in Table 3-1.

NOTE1. For detailed information on the WAN Rack 16, refer to the WAN Rack 16’s manual.

2. The WAN Rack 16’s design allows for the removal and insertion of communication and I/O modules without powering down the chassis.

Table 3-1. Installing the T1 CSU/DSU Card and its I/O Interface Module

Step Action1 If the T1 CSU/DSU Card module has been pre-installed, complete steps a through c.

If the T1 CSU/DSU Card module has not been pre-installed, complete step c.

CAUTION: To decrease the possibility of damage from a discharge of static electricity, use agrounding kit whenever you handle the T1 CSU/DSU Card module.

a) Release the T1 CSU/DSU Card module’s top and bottom ejector tabs. See Figure 3-1.b) Gently pull the module toward you until it’s removed from the WAN Rack 16 chassis. c) Set the Line Build-Out (LBO) switch according to your T-1 carrier requirements. For LBO switch

information, refer to Chapter 2.

NOTE: Place the LBO switch into the 0-dB position if the network mode is DSX-1.

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Table 3-1. Installing the T1 CSU/DSU Card and its I/O Interface Module (continued)

Step Action

2 Configure the two 12-switch DIPs (S1 and S3), located on the T1 CSU/DSU Card module, to supportdata application and T-1 network requirements. Refer to Chapter 4.

3 Select an unused front chassis slot. All slots have equal access to the chassis’s tri-bus mid-plane.Install the T1 CSU/DSU Card module into the chassis:a) Align the module with the chassis slot’s top and bottom card rails. See Figure 3-1.b) Hold each of the module’s ejector tabs in its open position. Gently push the T1 CSU/DSU

Card module forward along its card rails until it is seated in the mid-plane.c) Lock the top and bottom ejector tabs. These tabs secure the module to the chassis.d) With power applied to the WAN Rack 16 chassis, observe the Card’s front panel for LED

activity. If no LED activity is present, select another chassis slot and re-install the modulecard. If there is still no LED activity, there may be a power problem. Refer to Chapter 5.

4 If the I/O interface module has been pre-installed, go to step 5.If the I/O interface module has not been pre-installed, complete steps a through d.

CAUTION: To decrease the possibility of damage from static-electricity discharge, use a groundingkit whenever you handle the I/O interface module.

a) Locate the rear WAN Rack 16 chassis slot that physically matches (mirror image) the front slot that houses the T1 CSU/DSU Card module.

b) Align the I/O module with the chassis slot’s top and bottom card rails. See Figure 3-2.c) Push the I/O module forward along its card rails until it’s seated in the mid-plane.d) Hand tighten the top and bottom captive screws. These screws secure the I/O module to

the chassis.

5 Make sure that the two diagnostic loopback switches, located on the front of the T1 CSU/DSU Cardmodule, are in the center positions. See Figure 3-1.

6 Cable the I/O interface module (DTE Port A and NET) to support data application and networkrequirements. Refer to Appendix C.

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Figure 3-1. Installing the T1 CSU/DSU Card Module.

1615

14

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Figure 3-2. Installing the I/O Interface Module.

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4. Configuration

4.1 Configuration DIP SwitchesThe T1 CSU/DSU Card is controlled by a series of DIP-switch settings contained on two 12-switch DIPslocated next to the LBO switch. These DIP switches (S1 and S3) are configured to match specificnetwork and application requirements. Refer to Figure 4-1 for a description of each switch position.

Fill in this checklist before you set the DIP switches.

Configuration Parameters

Aggregate Timing Internal ____ External ____ Loop ____

Line Encoding B8ZS ____ AMI ____

Line Framing D4 _____ ESF (Fe) _____

Network Mode CSU _____ DSX-1 _____

Density Monitoring 000–133 ft. _____ 133–266 ft. _____

(DSX-1 Mode only) 266–399 ft. _____ 399–533 ft. _____ 533–655 ft. _____

DTE Channel Timing Loop 1 ____ Loop 2 ____

DTE Channel Multiple n x 56 Kbps ______ n x 64 Kbps _____

Data Rate _______ Kbps

DTE Port A Support V.35 _____ RS-449 _____

Request to Send (RTS) RTS constant On _____ RTS Controlled _____

DTE Channel Data Normal _____ Invert _____

DTE Channel Timing Normal _____ Invert _____

Zero Byte Suppression Enable _____ Disable _____

DS0 Mapping Contiguous _____ Alternate _____

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Figure 4-1. Configuration DIP Switches.

ON

1 2 3 4 5 6 7 8 9 10 11 12

ON

1 2 3 4 5 6 7 8 9 10 11 12

Reserved

ON: DTE Port A RS-449 enabled.OFF: DTE Port A V.35 enabled.

ON: DTE Channel Data is normal.OFF: DTE Channel Data is inverted.

ON: Loop 1 Timing is enabled. (Refer to Section 4.3.)OFF: Loop 2 Timing is enabled. (Refer to Section 4.3.)

ON: DTE Channel Multiple of n x 56 Kbps is enabled.OFF: DTE Channel Multiple of n x 64 Kbps is enabled.

S3-6 through S3-8 are used to select Density Monitoring. Refer to Table 4-2.

S3-3 through S3-5 are used to select CSU or DSX-1 Mode (Output Pulse). Refer to Table 4-3.

ON: AMI Line Coding is enabled.OFF: B8ZS Line Coding is enabled. Switch S3-9 must be ON.

ON: D4 Line Framing is enabled.OFF: ESF (Fe) Line Framing is enabled.

ON: Zero Byte Suppression is disabled.OFF: Zero Byte Suppression is enabled. Switch 3-2 must be ON.

ON: Contiguous DS0 Mapping.OFF: Alternate DS0 Mapping.

Reserved

Reserved

SWITCH 1 (S1)

SWITCH 3 (S3)

S1-1 through S1-3 are used to select Data Rates. (Refer to Table 4-1.)

ON: DTE Channel Timing is normal.OFF: DTE Channel Timing is inverted.

Aggregate Timing (Refer to Section 4.2).

ON: RTS always ON.OFF: RTS is Controlled.

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Table 4-1 describes the DIP settings that must be made to support the various n x 56 Kbps andn x 64 Kbps data rates.

Table 4-1. Setting Data Rates

Data Rate (Kbps) Data Rate Settings DS0s UsedS1-4 On S1-4 Off S1-1 S1-2 S1-3 S3-10 On S3-10 Off

56 64 On On On 1 1 - 2112 128 Off On On 1 - 2 1 - 4168 192 On Off On 1 - 3 1 - 6224 256 Off Off On 1 - 4 1 - 8336 384 On On Off 1 - 6 1 - 12448 512 Off On Off 1 - 8 1 - 16672 768 On Off Off 1 - 12 1 - 241344 1536 Off Off Off 1 - 24 N/A

Table 4-2 describes the DIP settings that must be made to support density monitoring.

Table 4-2. Setting Density Monitoring

Density Ratio DIP Switch S3-6 Position DIP Switch S3-7 Position DIP Switch S3-8 Position1 in 16 Off On On1 in 32 Off Off On1 in 48 Off On Off1 in 64 Off Off OffNone On N/A N/A

Table 4-3 describes the DIP settings that must be made to support either the CSU mode or the DSX-1mode (output pulse distance required).

Table 4-3. Setting Network Mode

Network Mode (CSU/DSX-1) DIP Switch S3-3 Position DIP Switch S3-4 Position DIP Switch S3-5 PositionCSU On Off OnDSX-1 (000–133 ft.) Off Off OnDSX-1 (133–266 ft.) On On OffDSX-1 (266–399 ft.) Off On OffDSX-1 (399–533 ft.) On Off OffDSX-1 (533–655 ft.) Off Off Off

T1 CSU/DSU CARD

26

4.2 Network TimingThe T1 CSU/DSU Card uses three types (modes) of aggregate timing: Internal (Master) Crystal Timing,Loop (Slave) Timing, and External Channel Timing. Table 4-4 describes the DIP settings that must bemade to support the various network timing modes.

Table 4-4. Setting Network Timing

Network Timing Mode DIP Switch S1-9 Position DIP Switch S1-10 PositionInternal (Master) Crystal On OnLoop (Slave) Off OnExternal Channel On Off

Internal (Master) Crystal Timing—Data is transmitted (clocked) to the network with a signal provided by the crystal in the T1 CSU/DSU Card. Timing for the data transmission from the DTE to the T1CSU/DSU Card is also clocked using this same signal. See Figure 4-2.

Figure 4-2. Internal (Master) Crystal Timing Diagram.

Loop (Slave) Timing—Receive data from the network, when received, is passed through a Phase LockLoop (PLL) circuit. The function of the PLL circuitry is to create a clock based on the line transmissions(marks) that is in phase with the incoming data. This clock is then used for both the receiver and theattached DTE equipment.

The PLL clock signal is also used as a reference for Send Timing (ST) to the DTE and also as the clockfor transmitting data to the network. In this timing scheme, both network and port timing are slaved tothe same clock source. A single clock source ensures synchronization between all data transmissions. SeeFigure 4-3.

DTE

ST

SD TRANSMITDATA BUFFER

AGGREGATEDATA BUFFER

XMIT DATAT-1

T1 CSU/DSU CARD

27

Figure 4-3. Loop (Slave) Timing Diagram.

External Channel Timing—Data is transmitted (clocked) to the network with a signal provided by theDTE. The DTE passes this clock signal to the T1 CSU/DSU Card via Terminal Timing (TT). Timing forthe data transmission from the DTE to the T1 CSU/DSU Card is also clocked using this same signal.DTE Channel Timing must be configured for Loop 1 if this timing mode is selected. See Figure 4-4.

Figure 4-4. External Channel Timing Diagram.

DTE

ST

SD TRANSMITDATA BUFFER

AGGREGATEDATA BUFFER

XMIT DATAT-1

TT

DTE

TT

SD

ST

RT

RD

TX DATATRANSMITTER

RECEIVERPLI

T–1

RX DATA

T–1

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4.3 DTE Channel TimingThe T1 CSU/DSU Card uses two types (modes) of DTE channel timing: Loop 1 Timing and Loop 2Timing.

Loop 1 Timing—This timing mode is used when Data Terminal Equipment (DTE), attached to Port Aon the I/O interface module (Port B is not used), will return (loop) a Terminal Timing (TT) clocksignal in response to receiving the Send Timing (ST) signal from the T1 CSU/DSU Card. See Figure 4-5.

When using Loop 1 Timing, the T1 CSU/DSU Card uses the TT clock signal to gate the Send Data (SD)Function (DTE data) into the network transmit data buffer. Clock function and data are subject to thesame delays and attenuation inherent in data transmission. Therefore, both the data and the clockingfunction should be in sync. As long as the interface specifications for distance versus speed have beenmet, the sampling of the incoming data should never lead or lag more than a few degrees.

Figure 4-5. Loop 1 Timing Diagram.

Loop 2 Timing—This timing mode is used when the Data Terminal Equipment (DTE), attached to PortA on the I/O interface module (Port B is not used), will not return (loop) a Terminal Timing (TT)clock signal in response to receiving the Send Timing (ST) signal from the T1 CSU/DSU Card. SeeFigure 4-6.

When using Loop 2 Timing, the T1 CSU/DSU Card uses its own Send Timing (ST) clock signal to gatethe Send Data (SD) Function (DTE data) into the network transmit data buffer.

NOTETransmission delays (an out-of-sync condition between the data and timing functions)may result from using this form of port timing. When using the Loop 2 Timing mode,adhere to all interface specifications.

DTE

TT

SD

ST

TRANSMITTER

NETWORKTIMING SOURCE

T-1

XMIT DATA

T1 CSU/DSU CARD

29

When using this timing mode, 100% throughput cannot always be guaranteed. If problems arise thatseem to be the result of using this timing mode, select DTE Channel Timing Invert (S1-6) whenconfiguring the T1 CSU/DSU Card. This causes the sampling of the Send Data to occur on the oppositeedge of the clock, which should allow for a more acceptable data transfer.

Figure 4-6. Loop 2 Timing Diagram.

DTESD

ST

TRANSMITTER

NETWORKTIMING SOURCE

XMIT DATA

T-1

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5. TroubleshootingBefore you start any troubleshooting routine, evaluate the problem:

• Check system messages and LEDs. Use all available system messages and LED indicators to helppinpoint where there’s a problem.

• Gather as much information as possible about the problem, such as configuration information andoperator action.

5.1 Power ProblemsThe T1 CSU/DSU Card gets its power entirely from the WAN Rack 16 chassis mid-plane. The loss ofmid-plane power will cause a lack of front-panel LED activity (network and channel port).

If there is more than one communication module in the chassis, see if each module is experiencing thesame symptoms. If so, there’s probably a chassis power loss.

To troubleshoot a power-related problem, refer to the WAN Rack 16 manual.

5.2 Network or Port ProblemsTroubleshooting a network or port interface problem involves collecting information about the problemand performing preliminary corrective actions.

Some of the information you should collect:

• LED conditions that may indicate a problem with the DTE, local T1 CSU/DSU Card, T-1line, or the remote unit. (Refer to Chapter 2 for descriptions of the network and DTEchannel LEDs.)

NOTEThe front-panel NETWORK LED labeled “TEST” (Red) may occasionally be activated asthe result of telco network testing. Contact your carrier if you are not conductingnetwork diagnostics and this LED condition is displayed.

• Alarm conditions associated with any attached DTE equipment.

• Verifying if the problem or condition is unique to the DTE port and its application, or ifother communication modules are affected.

• Determining if the problem or condition is related to a specific time of day or other commonfactors (for example, changes in electrical loads such as the activation of air-conditioningequipment).

Some of the corrective actions you should perform:

T1 CSU/DSU CARD

31

• Using the resident diagnostic loopbacks to isolate data paths associated with the problem.(See Section 5.3.)

• Confirming that the local T1 CSU/DSU Card and the remote unit’s configuration settingsare correct. (See Chapter 4.)

• Verifying equipment cable types and their connections. (Refer to Appendix C.)

5.3 Diagnostic Loopbacks

CAUTIONThe diagnostic loopbacks described in this chapter are all disruptive to normal DTEoperations.

The T1 CSU/DSU Card communication module contains four resident diagnostic loopbacks that arecontrolled from two rocker switches on the front of the module:

Local Aggregate Loopback—Placing the AGGREGATE LOOPBACK switch in the LOCAL positioncauses the local T1 CSU/DSU Card to place a loopback on its aggregate in the direction of the DTEchannel interface. This diagnostic loopback tests the local DTE channel interface and aggregate. Thelocal module’s front-panel NETWORK LED labeled “TEST” will light. Place the switch in the centerposition after diagnostic testing is complete. See Figure 5-1.

Figure 5-1. Local Aggregate Loopback Diagram.

Remote Aggregate Loopback—Placing the AGGREGATE LOOPBACK switch in the REMOTE positioncauses the remote T1 CSU/DSU Card to place a loopback on its aggregate in the direction of thenetwork. This diagnostic loopback tests the local DTE channel interface, aggregate, and T-1 networkpath. The front-panel NETWORK LED labeled “TEST” will light on both the local module and remoteunit. Place the switch in the center position after diagnostic testing is complete. See Figure 5-2.

TXCPE/TEST

EQUIPRX

CHANNELCHANNEL RX

TX

TX

RX

TX

RX

LOCAL UNIT REMOTE UNIT

RX

TX

CPE/TEST

EQUIP

RX

TX

T1 CSU/DSU CARD

32

Figure 5-2. Remote Aggregate Loopback Diagram.

Local Channel Loopback—Placing the CHANNEL LOOPBACK switch in the LOCAL position causes thelocal T1 CSU/DSU Card to place a bidirectional loopback on its DTE channel interface and aggregate.These diagnostic loopbacks test the local DTE channel interface and allow testing of the T-1 networkpath by the remote unit. The local module’s front-panel NETWORK LED labeled “TEST” will light.Place the switch in the center position after diagnostic testing is complete. See Figure 5-3.

Figure 5-3. Local Channel Loopback Diagram.

Remote Channel Loopback—Placing the CHANNEL LOOPBACK switch in the REMOTE positioncauses the remote T1 CSU/DSU Card to place a bidirectional loopback on its DTE channel interfaceand aggregate. These diagnostic loopbacks test the remote DTE channel interface and allow testing ofthe T-1 network path by the local module. The front-panel NETWORK LED labeled “TEST” will light onboth the local module and remote unit. Place the switch in the center position after diagnostic testing iscomplete. See Figure 5-4.

TXCPE/TEST

EQUIPRX

CHANNEL RX

TX

TX

RX

TX

RX


RX

TX

CPE/TEST

EQUIP

RX

TX

CHANNEL

TXCPE/TEST

EQUIPRX

CHANNELCHANNEL RX

TX

TX

RX

TX

RX


RX

TX

CPE/TEST

EQUIP

RX

TX

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Figure 5-4. Remote Channel Loopback Diagram.

If you have not been able to solve your network or DTE channel port problems after completing thesepreliminary actions, contact your supplier.

5.4 Calling Your SupplierIf you determine that your T1 CSU/DSU Card is malfunctioning, do not attempt to alter or repair theunit. It contains no user-serviceable parts. Contact your supplier.

Before you do, make a record of the history of the problem. Your supplier will be able to provide moreefficient and accurate assistance if you have a complete description, including:

• the nature and duration of the problem.

• when the problem occurs.

• the components involved in the problem.

• any particular application that, when used, appears to create the problem or make it worse.

5.5 Shipping and PackagingIf you need to transport or ship your Card:

• Package it carefully. We recommend that you use the original container.

• Before you ship, contact your supplier to get a Return Materials Authorization (RMA) number.

TXCPE/TEST

EQUIPRX

CHANNEL RX

TX

TX

RX

TX

RX


RX

TX

CPE/TEST

EQUIP

RX

TX

CHANNEL

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Appendix A. FCC DocumentRequirements

The following information, which informs the user of his rights and obligations in connecting thisequipment to the network and in ordering service, is required by FCC Part 68 Rules.

This equipment complies with Part 68 of FCC Rules. Please note the following:

1. When you order service, the telephone company needs to know:

The Facility Interface Code:

04DU-B (1.544 MB D4 framing format)

04DU9-C (1.544 MB ESF format)

The Service Order Code: 6.0F

A signal power affidavit (refer to Appendix B) will be required to guarantee encoded analogcontent and billing protection unless this unit is used in combination with an XD-type deviceor no encoded analog signals and billing information are transmitted. For most uses, thesecond box is appropriate.

The USOC Jack Required: RJ48C

In addition, if requested, inform the telephone company of the make, model, and FCCRegistration Number, which are on the label.

2. Your telephone company may make changes in its facilities, equipment, operations, orprocedures that could affect the proper functioning of your equipment. If they do, you will benotified in advance to give you an opportunity to maintain uninterrupted telephone service.

3. If your telephone equipment causes harm to the telephone network, the telephone companymay discontinue your service temporarily. If possible, they will notify you in advance, but ifadvance notice is not practical, you will be notified as soon as possible. You will be informed ofyour right to file a complaint with the FCC.

4. If you experience trouble with the telephone equipment, contact us for information onobtaining service or repairs. Repairs should be performed by us or our authorized agent.

5. You are required to notify the telephone company when this unit is disconnected from thenetwork.

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Appendix B. CPE AffidavitAffidavit for the connection of Customer Premises Equipment (CPE) to 1.544 Mbps and/or SubrateDigital Services (SDS)

For work to be performed in the certified territory of:

(TELCO’s Name)

State of: County of:

I, ,

(Name) (Business Address)

Representing

Being duly sworn, state:

I have responsibility for the operation and maintenance of the terminal equipment to be connected to 1.544 Mbps and/or Subrate Digital Services. The terminalequipment to be connected complies with Part 68 of the Commission’s rules except for the encodedanalog content and billing protection specifications.

Continued on the next page

T1 CSU/DSU CARD

36

CPE Affidavit, continued

With respect to encoded analog content and billing protection:

I attest that all operations associated with the establishment, maintenance, and adjustment of the digitalCPE with respect to encoded analog content and encoded billing information continuously comply withPart 68 of the FCC’s Rules and Regulations.

The digital CPE does not transmit digital signals containing encoded analog content or billinginformation which is intended to be decoded within the telecommunications network. The encodedanalog and billing protection is factory-set and is not under the control of the customer.

I attest that the operator(s)/maintenance(s) of the digital CPE responsible for the establishment,maintenance, and adjustment of the encoded analog content and billing information has (have) beentrained to perform these functions by successfully completing one of the following (check allappropriate boxes).

�� a. A training course provided by the manufacturer/grantee of the equipment used to encode analog signals: or

�� b. A training course provided by the customer or authorized representative, using training materials and instructions provided by the manufacturer/ grantee of the equipment used to encode analog signals: or

�� c. An independent training course (i.e., trade school or technical institution) recognized by the manufacturer/grantee of the equipment used to encode analog signals: or

�� d. In lieu of the preceding training requirements, the operator(s)/maintainer(s) is (are) under control of a supervisor trained in accordance with above.

(fill in one)

Continued on the next page

T1 CSU/DSU CARD

37

CPE Affidavit, continued

I agree to provide with proper documentation to demonstrate

(TELCO’s) name

compliance with the information as provided in the preceding paragraph, if so requested.

Signature Subscribed and Sworn to before me

Title this day of , 19

Date Notary Public

My commission expires:

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Appendix C. CablingRead this appendix before cabling the I/O interface module associated with your T1 CSU/DSU Cardcommunication module.

• We recommend using only 100-ohm, 22-AWG individually shielded twisted-pair cables. Thesecables provide protection from electromagnetic interference (EMI) and crosstalk.

• We recommend using only shielded RJ-48 cables terminated to shielded modular jacks. This willprevent EMI and crosstalk.

• Do not exceed the DTE cabling distances as recommended by the cable’s manufacturer. Doing somay result in signal attenuation.

• Make sure that all cable connectors (plug, screw, or clip) are correctly aligned and installed.Misalignment or improperly installed connectors may result in damage to pins, connectors,cables, or the unit.

• Determine if straight-through or crossover cables are required.

Pinouts for some of the common cables used on the I/O interface module are illustrated in Figure C-1.

T1 CSU/DSU CARD

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Figure C-1. Common Cable Pinouts.

A ENDRJ-48

B ENDRJ-48

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

A ENDDB15

B ENDRJ-48

1

2

3

6

7

8

9

11

5

8

2

6

7

3

4

1

A ENDDB15

B ENDDB15

1

9

3

11

5

6

7

8

1

9

3

11

5

6

7

8

A ENDRJ-48

B ENDRJ-48

1

2

3

4

5

6

7

8

4

5

3

1

2

6

7

8

A ENDDB15

B ENDRJ-48

1

3

9

11

2

8

6

7

2

5

1

4

8

3

6

7

A ENDDB25

B ENDDB25

1

2

3

4

5

6

7

8

20

1

2

3

4

5

6

7

8

20

100-ohm twisted pairRJ-48 to RJ-48 straight

DB15F to RJ-48Splitter to CSU

DB15M to DB15MSplitter to CSU

RJ-48 to RJ-48Splitter Back to Back

RJ-48 to DB15FPBX to Splitter

DB25M to DB25MTerminal to Modem

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Figure C-1. Common Cable Pinouts (continued).

A ENDRJ-48

B ENDRJ-48

1

3

4

5

6

7

8

8

5

7

3

6

4

1

A ENDRJ-48

B ENDRJ-48

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

A ENDRJ-48

B ENDDB25

1

2

3

4

5

6

7

8

5

8

3

20

2

7

6

4

A ENDRJ-48

B ENDDB25

1

2

3

4

5

6

7

8

4

NC

2

6

3

7

20

5

A ENDRJ-48

B ENDDB9

1

2

3

4

5

6

7

8

8

1

2

4

3

5

6

7

A ENDRJ-48

B ENDDB9

1

2

3

4

5

6

7

8

8

1

2

4

3

5

6

7

RJ-48 to DB9FDTE

RJ-48Special Crossover

RJ-48 to RJ-48Straight

RJ-48 to DB9MDTE

RJ-48 to DB25FDTE

RJ-48 to DB25MDCE

T1 CSU/DSU Card - Description

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